MathSciNet bibliographic data MR314747 10A25 Williams, H. C.; Zarnke, C. R. Some prime numbers of the forms \$2A3\sp{n}+1\$$2A3\sp{n}+1$ and \$2A3\sp{n}-1\$$2A3\sp{n}-1$. Math. Comp. 26 (1972), 995–998. Article

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